254 lines
6.9 KiB
C#
254 lines
6.9 KiB
C#
//
|
|
// System.TermInfoReader
|
|
//
|
|
// Authors:
|
|
// Gonzalo Paniagua Javier (gonzalo@ximian.com)
|
|
//
|
|
// (C) 2005 Novell, Inc (http://www.novell.com)
|
|
//
|
|
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining
|
|
// a copy of this software and associated documentation files (the
|
|
// "Software"), to deal in the Software without restriction, including
|
|
// without limitation the rights to use, copy, modify, merge, publish,
|
|
// distribute, sublicense, and/or sell copies of the Software, and to
|
|
// permit persons to whom the Software is furnished to do so, subject to
|
|
// the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be
|
|
// included in all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
//
|
|
#if !NET_2_1
|
|
using System.IO;
|
|
using System.Text;
|
|
namespace System {
|
|
// This class reads data from a byte array or file containing the terminfo capabilities
|
|
// information for any given terminal. The maximum allowed size is 4096 bytes.
|
|
//
|
|
// Terminfo database files are divided in the following sections:
|
|
//
|
|
// Header
|
|
// Terminal names
|
|
// Boolean capabilities
|
|
// Numeric capabilities
|
|
// Offset of string capabilities
|
|
// String capabilities
|
|
//
|
|
// The header is as follows:
|
|
//
|
|
// Magic number (0x1 and 0x1A)
|
|
// Terminal names size
|
|
// Boolean section size
|
|
// Numeric section size
|
|
// String offsets section size
|
|
// Strings size
|
|
//
|
|
// After the header, there's a NUL terminated string containing terminal names separated
|
|
// by the character '|'. The last one is the terminal description.
|
|
//
|
|
// The boolean capabilities section has bytes that are set to 1 if the capability is supported
|
|
// and 0 otherwise. If the index of a capability is greater than the section size, 0 is assumed.
|
|
//
|
|
// The numeric capabilities section holds 2-byte integers in little endian format. No negative
|
|
// values are allowed and the absence of a capability is marked as two 0xFF.
|
|
//
|
|
// The string offsets section contains 2-byte integer offsets into the string capabilies section.
|
|
// If the capability is not supported, the index will be two 0xFF bytes.
|
|
//
|
|
// The string capabilities section contains NUL terminated strings starting at the offsets found
|
|
// in the previous section.
|
|
//
|
|
// Terminal capabilities indexes are found in /usr/include/term.h file and described in
|
|
// 'man 5 terminfo'.
|
|
//
|
|
|
|
class TermInfoReader {
|
|
//short nameSize;
|
|
short boolSize;
|
|
short numSize;
|
|
short strOffsets;
|
|
//short strSize;
|
|
|
|
//string [] names; // Last one is the description
|
|
byte [] buffer;
|
|
int booleansOffset;
|
|
//string term;
|
|
|
|
public TermInfoReader (string term, string filename)
|
|
{
|
|
using (FileStream st = File.OpenRead (filename)) {
|
|
long length = st.Length;
|
|
if (length > 4096)
|
|
throw new Exception ("File must be smaller than 4K");
|
|
|
|
buffer = new byte [(int) length];
|
|
if (st.Read (buffer, 0, buffer.Length) != buffer.Length)
|
|
throw new Exception ("Short read");
|
|
|
|
ReadHeader (buffer, ref booleansOffset);
|
|
ReadNames (buffer, ref booleansOffset);
|
|
}
|
|
|
|
}
|
|
|
|
public TermInfoReader (string term, byte [] buffer)
|
|
{
|
|
if (buffer == null)
|
|
throw new ArgumentNullException ("buffer");
|
|
|
|
this.buffer = buffer;
|
|
ReadHeader (buffer, ref booleansOffset);
|
|
ReadNames (buffer, ref booleansOffset);
|
|
}
|
|
|
|
// public string Term {
|
|
// get { return term; }
|
|
// }
|
|
|
|
void ReadHeader (byte [] buffer, ref int position)
|
|
{
|
|
short magic = GetInt16 (buffer, position);
|
|
position += 2;
|
|
if (magic != 282)
|
|
throw new Exception (String.Format ("Magic number is wrong: {0}", magic));
|
|
|
|
/*nameSize =*/ GetInt16 (buffer, position);
|
|
position += 2;
|
|
boolSize = GetInt16 (buffer, position);
|
|
position += 2;
|
|
numSize = GetInt16 (buffer, position);
|
|
position += 2;
|
|
strOffsets = GetInt16 (buffer, position);
|
|
position += 2;
|
|
/*strSize =*/ GetInt16 (buffer, position);
|
|
position += 2;
|
|
}
|
|
|
|
void ReadNames (byte [] buffer, ref int position)
|
|
{
|
|
string prev = GetString (buffer, position);
|
|
position += prev.Length + 1;
|
|
//names = prev.Split ('|');
|
|
}
|
|
|
|
public bool Get (TermInfoBooleans boolean)
|
|
{
|
|
int x = (int) boolean;
|
|
if (x < 0 || boolean >= TermInfoBooleans.Last || x >= boolSize)
|
|
return false;
|
|
|
|
int offset = booleansOffset;
|
|
offset += (int) boolean;
|
|
return (buffer [offset] != 0);
|
|
}
|
|
|
|
public int Get (TermInfoNumbers number)
|
|
{
|
|
int x = (int) number;
|
|
if (x < 0 || number >= TermInfoNumbers.Last || x > numSize)
|
|
return -1;
|
|
|
|
int offset = booleansOffset + boolSize;
|
|
if ((offset % 2) == 1)
|
|
offset++;
|
|
|
|
offset += ((int) number) * 2;
|
|
return GetInt16 (buffer, offset);
|
|
}
|
|
|
|
public string Get (TermInfoStrings tstr)
|
|
{
|
|
int x = (int) tstr;
|
|
if (x < 0 || tstr >= TermInfoStrings.Last || x > strOffsets)
|
|
return null;
|
|
|
|
int offset = booleansOffset + boolSize;
|
|
if ((offset % 2) == 1)
|
|
offset++;
|
|
|
|
offset += numSize * 2;
|
|
int off2 = GetInt16 (buffer, offset + (int) tstr * 2);
|
|
if (off2 == -1)
|
|
return null;
|
|
|
|
return GetString (buffer, offset + strOffsets * 2 + off2);
|
|
}
|
|
|
|
public byte [] GetStringBytes (TermInfoStrings tstr)
|
|
{
|
|
int x = (int) tstr;
|
|
if (x < 0 || tstr >= TermInfoStrings.Last || x > strOffsets)
|
|
return null;
|
|
|
|
int offset = booleansOffset + boolSize;
|
|
if ((offset % 2) == 1)
|
|
offset++;
|
|
|
|
offset += numSize * 2;
|
|
int off2 = GetInt16 (buffer, offset + (int) tstr * 2);
|
|
if (off2 == -1)
|
|
return null;
|
|
|
|
return GetStringBytes (buffer, offset + strOffsets * 2 + off2);
|
|
}
|
|
|
|
short GetInt16 (byte [] buffer, int offset)
|
|
{
|
|
int uno = (int) buffer [offset];
|
|
int dos = (int) buffer [offset + 1];
|
|
if (uno == 255 && dos == 255)
|
|
return -1;
|
|
|
|
return (short) (uno + dos * 256);
|
|
}
|
|
|
|
string GetString (byte [] buffer, int offset)
|
|
{
|
|
int length = 0;
|
|
int off = offset;
|
|
while (buffer [off++] != 0)
|
|
length++;
|
|
|
|
return Encoding.ASCII.GetString (buffer, offset, length);
|
|
}
|
|
|
|
byte [] GetStringBytes (byte [] buffer, int offset)
|
|
{
|
|
int length = 0;
|
|
int off = offset;
|
|
while (buffer [off++] != 0)
|
|
length++;
|
|
|
|
byte [] result = new byte [length];
|
|
Buffer.InternalBlockCopy (buffer, offset, result, 0, length);
|
|
return result;
|
|
}
|
|
|
|
internal static string Escape (string s)
|
|
{
|
|
StringBuilder sb = new StringBuilder ();
|
|
for (int i = 0; i < s.Length; i++) {
|
|
char current = s [i];
|
|
if (Char.IsControl (current)) {
|
|
sb.AppendFormat ("\\x{0:X2}", (int) current);
|
|
} else {
|
|
sb.Append (current);
|
|
}
|
|
}
|
|
|
|
return sb.ToString ();
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|